Australia's youngest federal politician, 20-year-old Liberal National Party (LNP) candidate Wyatt Roy, admits his university studies may proceed more slowly after his win in the Queensland seat of Longman.

Mr Roy says he is still cautious and humbled about his win in the seat, north of Brisbane, but with more than three-quarters of the vote counted there has been a 4.3 per cent swing to the newcomer.

He defeated Labor's Jon Sullivan, who won Longman in 2007, an electorate covering areas between Brisbane and the Sunshine Coast.

Mr Roy says he was never naturally attracted to politics.

"I think politics is something people feel a little bit excluded by and disenfranchised by," he said.

"But as I said, I got sick of complaining, put my hand up and the locals here judged me on what I said and what I will do."

Mr Roy says he worked hard to overcome bias in the LNP and the electorate.

"The people that preselected me were locals and they had a lot of criticism levelled at them because I was not always perceived as the likeliest candidate," he said.

"But we ran a traditional grassroots campaign - I did a lot of town meetings, I did a lot of door-knocking.

Free trade is the oldest argument in federal politics and the issue that literally defined the federation era but opposition exists to the TPP, courtesy of the Investor-State Dispute Resolutions clause.